A simple method for determining ammonia in water at the ppm level

Boo, Hong‐Kwen; S., T.

doi:10.1007/bf01220109

Cited by 13 publications

(4 citation statements)

References 3 publications

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“…Then, the adsorption of ammonium onto activated carbon from aqueous solutions was studied in a batch-stirred cell. The optimization process was carried out over a wide range of pH values (3)(4)(5)(6)(7)(8)(9), adsorbent doses (40-80 mg), temperatures (288-318 °K), initial ammonium concentrations (10-40 mg L -1 ), and contact times (15-120 min). The optimized conditions for effective ammonium adsorption were pH=7, adsorbent dose 50 mg, temperature 318°K, and contact time 60 min.…”

Section: Discussionmentioning

confidence: 99%

“…Batch experiments were performed in a 1000 mL stirred glass flask to investigate ammonium ion adsorption on OAC from aqueous solutions. Adsorption experiments were conducted by taking (0.4-0.8 g L -1 ) activated carbon with 1000 mL of ammonium ion solution at the desired concentration (10-40 mg L -1 ) and pH (3)(4)(5)(6)(7)(8)(9). Then, this flask was placed on a stirrer at 150 rpm for 120 min at room temperature.…”

Section: Batch Adsorption Processmentioning

confidence: 99%

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Ammonium ion adsorption from aqueous solutions by using modified activated carbon derived from rice straw

Sedaghat,

Bahramifar,

Younesi

2023

Preprint

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Many of the health problems of organisms have been attributed to the excessive release of ammonia and nitrogen-containing compounds into the environment. The study was conducted to identify the potential use of oxidized activated carbon (OAC) to remove ammonium ions from aqueous solutions on modified activated carbon in batch system adsorption. BET, SEM, and FTIR analyses were used to characterize the obtained adsorbent. The effects of adsorbent dose, initial concentration of ammonium ions, pH, temperature and contact time on removal efficiency were evaluated. Additionally, kinetic, thermodynamic and isotherm models were investigated to understand the mechanism of adsorption of ammonium ions on OAC. The results showed that 97% of ammonium was removed by modified activated carbon. The adsorption of ammonium ions on OAC increases with increasing adsorbent dose, pH, and contact time. Moreover, it decreased with an increasing initial concentration of ammonium ions. The equilibrium ammonium ion adsorption data for OAC were better fitted with the Langmuir model (r2= 0.999), and a maximum adsorption capacity of 41.50 mg g-1 was achieved. The ammonium ion absorbance kinetics were best described by a pseudo-second-order model (r2=0.999). The prepared adsorbent maintained its efficiency for up to 10 adsorption/desorption cycles. Due to its high adsorption capability and good stability, modified activated carbon powder can be utilized as a worthy adsorbent in water and wastewater treatment.

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Section: Discussionmentioning

confidence: 99%

Section: Batch Adsorption Processmentioning

confidence: 99%

Ammonium ion adsorption from aqueous solutions by using modified activated carbon derived from rice straw

Sedaghat,

Bahramifar,

Younesi

2023

Preprint

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“…Alkali metal salts such as lithium salts, are known to be one of these interferents for the Berthelot methods. 65 Such salts are used extensively as supporting electrolytes for NRR experiments, especially in electrochemical nitrogen fixation experiments, where lithium, 31 sodium 66,67 and potassium 32,[68][69][70] chlorides, 70,71 perchlorates 31 and sulfates 32,[66][67][68] can be found ubiquitously. Despite their widespread use, to the best of our knowledge, no previous work has quantitatively studied the interferences of these alkali metal salts on the ammonia quantification results obtained with the salicylate method.…”

Section: List Of Symbolsmentioning

confidence: 99%

Alkali Metal Salt Interference on the Salicylate Method for Quantifying Ammonia from Nitrogen Reduction

et al. 2022

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The salicylate method has been extensively used for quantifying ammonia in the emerging field of nitrogen (electro)fixation. Alkali metal salts are widely used as supporting electrolytes for nitrogen reduction, especially in the context of electrochemical nitrogen fixation. However, these salts are known to cause interferences on the salicylate method, introducing significant uncertainties in ammonia quantification. In this work, the interference of lithium, sodium and potassium chlorides, perchlorates and sulfates on the ammonia quantification results obtained using the salicylate method was experimentally quantified, and an empirical model was developed to capture the effect of the presence of these interferents on the ammonia quantification by the salicylate method. Based on the obtained experimental interference results, the tested interferents can be ranked from stronger interferent (i.e. lower admissible concentration) to weaker interferent: Li2SO4, KClO4, LiCl, LiClO4, K2SO4, NaClO4, NaCl, Na2SO4, KCl. The developed model can be used to assess the experimental error in ammonia quantification from nitrogen reduction, in samples containing these interferents. This model can be used to correct the interferences on the ammonia quantification, when the interferent concentration in a sample is known (or measurable).

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“…Kjeldahl digestion using CuS04 (37,38) or Ti02 (39) in place of Hg was shown to be satisfactory. Colorimetric determination of ammonia by the indophenol reaction (40) was generally employed in the automated systems (41)(42)(43)(44). Other methods involve the use of NH3-electrode (45), sodium salicylate ( 46), or chloramine-T (47).…”

Section: Determination Of Major Constituentsmentioning

confidence: 99%